Class: RubySlime::Mongoid::Interactor

Inherits:
Object
  • Object
show all
Defined in:
lib/ruby_slime/mongoid/interactor.rb

Instance Method Summary collapse

Constructor Details

#initialize(state_key:, load_process:, event_handler: nil, mongoid_model: State) ⇒ Interactor

Returns a new instance of Interactor.



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# File 'lib/ruby_slime/mongoid/interactor.rb', line 6

def initialize(
  state_key:,
  load_process:,
  event_handler: nil,
  mongoid_model: State
)
  @state_key = state_key
  @load_process = load_process
  @event_handler = event_handler
  @mongoid_model = mongoid_model
  freeze
end

Instance Method Details

#call(*commands) ⇒ Object 



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# File 'lib/ruby_slime/mongoid/interactor.rb', line 19

def call(*commands)
  lazy_key = @state_key.respond_to?(:call)
  state_record = if lazy_key
    @mongoid_model.new
  else
    @mongoid_model.where({
      _id: @state_key,
    }).first_or_initialize
  end
  process = @load_process.call(
    state: state_record.state,
  )
  metadata_buffer = {
    next_position: state_record.next_position,
  }
  pending_events = commands.each do |command|
    process.call(command)
  end.then do
    process.pending_events
  end
  return pending_events unless pending_events.present?
  state_record.state = process.state
  state_record.next_position += pending_events.size
  state_record._id = @state_key.call if lazy_key
  begin
    pending_events
  ensure
    if state_record.new_record?
      begin
        state_record.save!
      rescue ::Mongo::Error::OperationFailure => e
        raise e unless e.code == 11000 # E11000 duplicate key error
        raise StaleRecord
      end
    else
      update_result = @mongoid_model.where({
        _id: state_record._id,
        lock_version: state_record.lock_version,
      }).update_all({
        '$set': {
          state: state_record.state,
          next_position: state_record.next_position,
        }.compact,
        '$inc': {
          lock_version: 1,
        },
      })
      raise StaleRecord unless 0 < update_result.matched_count
    end
    metadata_buffer[:state_key] = state_record._id
    @event_handler&.call(
      pending_events,
      **metadata_buffer,
    )
  end
end